EP3889618A1 - Stromwandler - Google Patents
Stromwandler Download PDFInfo
- Publication number
- EP3889618A1 EP3889618A1 EP20166923.1A EP20166923A EP3889618A1 EP 3889618 A1 EP3889618 A1 EP 3889618A1 EP 20166923 A EP20166923 A EP 20166923A EP 3889618 A1 EP3889618 A1 EP 3889618A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- pick
- output
- circuit
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000004020 conductor Substances 0.000 claims abstract description 13
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 16
- 239000010410 layer Substances 0.000 description 11
- 230000005355 Hall effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/207—Constructional details independent of the type of device used
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
Definitions
- the present invention relates to an open-loop current transducer for measurement of currents over a high frequency range.
- Wide Band Gap semiconductors have opened the possibility of significantly faster switching frequencies and steeper transitions between states, resulting in switched currents with higher di / dt, and switched voltages with higher dv / dt.
- Many applications use current measurement as an input to their control loops, and in order to implement advanced control schemes, fast and accurate current measurement is required, resulting in bandwidth requirements that are 1 to 2 orders of magnitude higher than in previous generations of current transducers (100 kHz ⁇ 5 MHz).
- Open-loop current transducers are widely used for measuring electrical current flowing in a primary conductor.
- Such sensors typically comprise a magnetic core surrounding the primary conductor, comprising an air-gap in which a magnetic field detector is positioned.
- the magnetic field detector may typically be a Hall effect sensor or a magneto-resistive magnetic field sensor. Hall sensors however have a limited bandwidth. Magnetoresistive sensors may have a high bandwidth, but they have a limited offset stability as well as 1 / f noise and they also suffer from perming and hysteresis.
- An open loop transducer for high bandwidth and high current range measurement as described in EP1965217 combines the high frequency measurement capability of a planar pick-up coil with a Hall sensor.
- the pick-up coil is realized as circuit tracks on a PCB, series connected to the output of an amplifier connected to the Hall sensor.
- a drawback of this known transducer is that the crossover frequency at which the coil starts to contribute is about an order of magnitude lower than the natural roll-off of the Hall sensor unit which results in a large deviation from an ideal flat frequency response over a large current measurement range.
- an object of this invention is to provide an open-loop current transducer having a wide frequency bandwidth for measuring currents with a short response time, and a large amplitude range that has a high offset stability and a frequency response with a low deviation from an ideal flat frequency response over the measurement range.
- a wide frequency bandwidth may in particular be from 0 (DC) to about 1-5 MHz.
- a large current amplitude range may be about from 0A to a maximum in a range of 50A to 300A.
- an open-loop electrical current transducer for measuring an electrical current flowing in a primary conductor, comprising a magnetic circuit core with an air-gap, and a magnetic field sensing device positioned at least partially in said air-gap, the magnetic field sensing device comprising a circuit board, a first magnetic field detector in the form of an ASIC mounted on the circuit board, and a second magnetic field detector in the form of a conductive pick-up coil formed on two or more layers in or on the circuit board.
- the outputs of the first and second magnetic field detectors are connected to a signal processing circuit generating an output signal representative of said electrical current, the output of the ASIC representing a low frequency (LF) channel and the output of the pick-up coil representing a high frequency (HF) channel.
- the signal processing circuit comprises an adding circuit configured to sum a signal output by the LF channel with a signal output by the HF channel, and one or more circuit components to adjust a gain of the output signal of the pick-up coil to a gain of the output signal of the ASIC .
- the adding circuit comprises an operational amplifier, a resistance connected across the operational amplifier between a negative input and an output of operational amplifier and a capacitance connected across the operational amplifier between a negative input and an output of operational amplifier, thus forming an inverting summing circuit with low pass filtering.
- the transducer according to embodiments of the invention advantageously allows measurement of a primary current over a bandwidth from DC to several MHz, with frequency response flatness better than ⁇ 1 dB, and a highly stable offset, typically less than 0.1 % of full scale.
- the open loop response time achievable with a transducer according to embodiments of the invention may be about or less than 10ns (10x10 -9 seconds).
- the transducer according to embodiments of the invention also advantageously has a good signal to noise ratio (SNR) since output noise from the ASIC is filtered by the low pass filter of the operational amplifier circuit.
- SNR signal to noise ratio
- a positive input of the operational amplifier is connected to a reference Voltage source of the signal processing circuit.
- the positive input of the operational amplifier is further connected to an external voltage reference connection via a resistor.
- the reference Voltage source is connected to the positive input of the operational amplifier via a series resistance and parallel capacitance configured to adapt the impedance and reduce noise on the Voltage reference input.
- one or more circuit components to adjust the gain of the output signal of the pick-up coil to the gain of the output signal of the ASIC comprises a gain adjust resistor connected in series to the output of the pick-up coil.
- the gain adjust resistor is adjustable: by laser trimming of said gain adjust resistor; by providing said gain adjust resistor as a programmable resistor realized on an integrated circuit; or by adding or removing one or more additional resistors connected in parallel to said gain adjust resistor.
- the signal processing circuit comprises a capacitance connected in series to the output of the pick-up coil.
- the magnetic field sensing device comprises electrostatic screens connected to ground and arranged on both sides of the pick-up coil and overlapping the pick-up coils configured to reduce capacitive coupling between the primary conductor and the pick-up coil, the electrostatic screens comprising each a plurality of conductive circuit traces on the circuit board separated by non-conductive gaps configured to reduce eddy currents.
- the pick-up coil comprises at least two coil portions on different layers embedded within the circuit board substrate and connected together in series by a conductive connection path through the layers.
- the electrostatic screens are formed on opposed outer sides of the circuit board.
- an electrical current transducer 1 for measuring the current flowing in a primary conductor 19 traversing a central aperture 2 of the transducer comprises a magnetic circuit 3 with an air-gap 4, and a magnetic field sensing device 5 positioned at least partially in the air-gap.
- the magnetic circuit 3 may be made of a stack of laminations, or of a solid core, of different shapes and sizes and of different magnetically conducting materials, as is known in the art.
- the magnetic circuit may also be split in two parts to allow assembly of the sensor around a primary conductor, as is known in the art. Further, a portion of the primary conductor 19 may be integrated into the sensor and have terminals for connection to a primary conductor, as is known in the art.
- the magnetic core is made of a ferrite material in order to better support high frequency primary currents compared to soft iron cores.
- the current sensor may be provided with a second air-gap and a second magnetic field sensing device positioned at least partially in said second air-gap.
- the magnetic field sensing device comprises a circuit board 7, a first magnetic field detector 8 mounted on the circuit board, a second magnetic field detector 12 and a signal processing circuit 6.
- the signal processing circuit 6 is provided on the circuit board 7 and is connected to the magnetic field detectors 8,12.
- Connection terminals 20 connected to the circuit board allow connection to external circuitry (not shown) of a device (e.g. an electrical motor) in which the transducer is implemented for measurement of a primary current (e.g. a phase current of the electrical motor), typically to control a function of the device (e.g. the operation of the motor).
- a device e.g. an electrical motor
- a primary current e.g. a phase current of the electrical motor
- the first magnetic field detector 8 is, in a preferred embodiment, in the form of a Hall effect sensor included in an integrated circuit (ASIC) with connection terminals 10 connected, for example by soldering, to circuit traces on the circuit board 7.
- the first magnetic field detector may however also comprise other types of known magnetic field sensors such as a magneto-resistive magnetic field sensor, or a fluxgate magnetic field sensor.
- the Hall effect sensor may be operated using per se known current spinning techniques to reduce offset and 1/f noise.
- the second magnetic field detector 12 of the magnetic sensing device comprises a conductive coil comprising at least two coil portions 12a, 12b formed by circuit traces on different layers on or within the circuit board.
- the coil portions may be connected together in series to form a single pick-up coil.
- the coil portions may be connected together by means of a conductive plated through-hole 14 or an interconnection pin or path through the board to interconnect the coil portions.
- the coil can thus be formed on the circuit board by means of conventional technology for producing conductive tracks on circuit boards, thus benefiting from the presence of the circuit board for connection of the first magnetic field detector and for the signal processing or preprocessing circuit 6.
- the coil is preferably connected to a reference voltage VREF of the ASIC instead of to ground to reduce noise on the output is of the coil.
- the circuit board may advantageously further comprise electrostatic screens 13a, 13b on top and bottom layers such that the pick-up coil 12 is sandwiched between the electrostatic screens that form electrical shielding layers around the pick-up coil.
- the shielding layers reduce capacitive coupling between the pick-up coil 12a, 12b and the primary conductor 19 directly or via the magnetic core 3. This provides protection against electrical disturbances, in particular generated by primary currents with high rates of voltage change (high dV/dt).
- the electrostatic screens may be formed on the circuit board by means of conventional technology for producing conductive tracks on circuit boards and may be connected to ground or another reference voltage connection.
- the electrostatic screens may be formed on opposed outer surfaces of the circuit board, and the pick-up coil on inner embedded layers, however the electrostatic screens may also be arranged on layers embedded within the circuit board substrate.
- the electrostatic screens may advantageously have a comb structure with a plurality of conductive tracks separated by non-conductive tracks in order to reduce eddy currents from forming in the shield layer.
- the conductive tracks are electrically interconnected together preferably only at one end of the tracks to prevent eddy currents circulating in loops that would otherwise be formed by the tracks if they were connected together at both extremities.
- the multi-layer pick-up coil has an increased gain over a single layer coil and advantageously allows to reduce the cut off frequency of the low pass filter to obtain a low noise output for the signal from the pick-up coil.
- the signal processing circuit 6 comprises circuitry to combine the output signal from the first magnetic field detector 8 representing a low frequency (LF) channel and the output signal from the pick-up coil 12 representing a high frequency (HF) channel.
- the two output signals are advantageously combined by summing the LF and HF output signals using an adding circuit 24 that may advantageously comprise a low pass filter 25.
- the adding circuit 24 with low pass filter 25 comprises an operational amplifier 26 and a resistance R1 and a capacitance C1 connected across the operational amplifier between a first input (the negative input) and an output of operational amplifier, thus forming an inverting summing circuit with low pass filtering.
- the operational amplifier 26, resistance R1 and capacitance C1 forms an active first order low pass filter.
- the second input (the positive input) of the operational amplifier is connected to a reference Voltage.
- the reference Voltage input may be connected to a reference Voltage source VREF of the signal processing circuit (e.g. a 2,5V voltage source), optionally via a series resistance Rr2 and parallel capacitance Cr, to adapt the impedance and reduce noise.
- the level of the input reference Voltage may optionally be adjusted by an external connection VREF_IN connected to the second input of the operational amplifier via a resistor Rr1.
- the latter allows a user of the current transducer to adapt the voltage level of the transducer output measurement signal Uout to user requirements, in particular the requirements of the external circuitry to which the transducer is connected via the connection terminals 20. This would allow for instance the user to change the voltage level of the output measurement signal such that it remains a positive current over the full measurement range of the transducer, which in many applications is convenient for the control of a device.
- the gain of the first magnetic field sensor included in an ASIC may be adjusted by a resistor Rdc connected to the ASIC output OUT and/or by adjusting registers in the integrated circuit of the ASIC to set the current output level of the ASIC.
- a high pass filter 21 may be formed by a capacitance Cac that removes any DC or low frequency signal, preferably signals with a frequency below 10Hz.
- the capacitance Cac helps to reduce gain at direct current (DC) or low frequencies for the HF path and avoid amplifying the operational amplifier offset.
- the pick-up coil gain may advantageously be adjusted to match the gain of the LF channel such that the summing of the two signals has a frequency response that is close to an ideal flat frequency response, preferably better than +/- 1 dB while benefitting from a highly stable offset.
- the stable offset comes from the combination of providing a Hall effect sensor in an ASIC driven with a high frequency current spinning technique but operating at low frequency primary current measurement, and on the other hand providing a multilayer pick up coil formed on the circuit board (thus allowing to have a larger magnetic field pick-up surface area than the ASIC) operating at higher frequencies, the pick-up coil inherently having no offset drift.
- the summing of the signals according to the invention allows to flatten the frequency response, whereas in a series connection the crossover frequency at which the coil starts to contribute is about an order of magnitude lower than the natural roll-off of the Hall sensor unit which results in a large deviation from an ideal flat frequency response over a large current measurement range.
- the gain adjustment of the HF channel may advantageously be effected by a resistor Rac connected in series to the output of the pick-up coil.
- the resistance value of the HF channel gain adjust resistor Rac may adjusted by various means, including: by laser trimming of the resistor Rac; by providing Rac as a programmable resistor realized on an integrated circuit; or by adding or removing one or more additional resistors connected in parallel to Rac.
- the LF channel may further comprise a sensitivity adjust component 23, for instance to allow calibration of the transducer such as to compensate for variations in the length of the magnetic gap 4.
- This sensitivity adjust component may be effected as a programmable element in the ASIC to adjust the output level OUT or by using a programmable gain amplifier (PGA) (not shown) at the output of the ASIC.
- PGA programmable gain amplifier
- LF path below the crossover frequency defined by the time constant R1 ⁇ C1 the operational amplifier circuit amplifies the ASIC output voltage by a factor R1/Rdc. If there were no other components, the circuit would be a simple active first order lowpass, its corner frequency being the one mentioned above.
- the idealized output voltage of the pick-up coil rises proportional with the frequency of the current to be measured, its phase leads by 90°.
- the signal In the frequency range where the signal is to be used as an image of the primary current, it should pass through an integrator. This is the function of the illustrated circuit for frequencies higher than the crossover frequency where the pick-up coil voltage is higher than the ASIC output voltage.
- the HF gain In order to obtain a smooth transition between the two frequency ranges, the HF gain should be adjusted so that at the crossover frequency the output voltage of the pick-up coil has the same amplitude as the one from the ASIC. In practice (due to parasitic elements not shown in the circuit diagram, non-linearities etc.) a slightly better response in the time domain may be obtained by adjusting the HF gain slightly higher than the LF gain.
- the capacitance Cac should have a high capacitance value, preferably between 5-20 ⁇ F, for instance around 10 ⁇ F for a good price/performance compromise.
- C1 capacitances between 1 nF and 10 nF are preferably used; R1: resistance values may vary between 30 k ⁇ to 200 k ⁇ depending on the desired gain; Crossover frequencies around 1 kHz are preferable; for a given crossover frequency an increasing C1 improves the dv/dt perturbation effects (from 1 nF to 10 nF by a factor of 10).
- the gain adjust resistance Rac needs to be decreased in order to keep the crossover frequency at a desired value, for instance 1 kHz, and the performance on di / dt is degraded, so a compromise needs to be found depending on the desired transducer sensitivity.
- the gain adjust resistance Rac should preferably be higher than 1 k ⁇ ,, better if higher (from 1k ⁇ to 30 k ⁇ ; depending on the transducer gain).
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20166923.1A EP3889618A1 (de) | 2020-03-31 | 2020-03-31 | Stromwandler |
KR1020227037710A KR20220164529A (ko) | 2020-03-31 | 2021-03-24 | 전류 변환기 |
PCT/EP2021/057616 WO2021197970A1 (en) | 2020-03-31 | 2021-03-24 | Current transducer |
JP2022559664A JP2023519988A (ja) | 2020-03-31 | 2021-03-24 | 電流変換器 |
US17/915,614 US20230132919A1 (en) | 2020-03-31 | 2021-03-24 | Current transducer |
EP21713675.3A EP4127738A1 (de) | 2020-03-31 | 2021-03-24 | Stromwandler |
CN202180024015.XA CN115362376A (zh) | 2020-03-31 | 2021-03-24 | 电流换能器 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20166923.1A EP3889618A1 (de) | 2020-03-31 | 2020-03-31 | Stromwandler |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3889618A1 true EP3889618A1 (de) | 2021-10-06 |
Family
ID=70108103
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20166923.1A Withdrawn EP3889618A1 (de) | 2020-03-31 | 2020-03-31 | Stromwandler |
EP21713675.3A Pending EP4127738A1 (de) | 2020-03-31 | 2021-03-24 | Stromwandler |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21713675.3A Pending EP4127738A1 (de) | 2020-03-31 | 2021-03-24 | Stromwandler |
Country Status (6)
Country | Link |
---|---|
US (1) | US20230132919A1 (de) |
EP (2) | EP3889618A1 (de) |
JP (1) | JP2023519988A (de) |
KR (1) | KR20220164529A (de) |
CN (1) | CN115362376A (de) |
WO (1) | WO2021197970A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4235193A1 (de) * | 2022-02-28 | 2023-08-30 | LEM International SA | Magnetfelddetektormodul |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117538590A (zh) * | 2023-11-16 | 2024-02-09 | 浙江森尼克半导体有限公司 | 一种霍尔传感器电路和电子设备 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5461353A (en) * | 1994-08-30 | 1995-10-24 | Motorola, Inc. | Printed circuit board inductor |
US6366076B1 (en) * | 1997-04-21 | 2002-04-02 | Liaisons Electroniques-Mecaniques Lem Sa | Device with wide passband for measuring electric current intensity in a conductor |
EP1965217A1 (de) | 2007-03-02 | 2008-09-03 | Liaisons Electroniques-Mecaniques Lem S.A. | Stromsensor mit offenem Regelkreis und hoher Bandbreite |
US20090167301A1 (en) * | 2007-12-27 | 2009-07-02 | Infineon Technologies Ag | Integrated circuit including a magnetic field sensitive element and a coil |
US20140253108A1 (en) * | 2013-03-08 | 2014-09-11 | Deere & Company | Method and sensor for sensing current in a conductor |
US20150219692A1 (en) * | 2013-12-11 | 2015-08-06 | Deere & Company | Current sensor and control circuit |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9291648B2 (en) * | 2013-08-07 | 2016-03-22 | Texas Instruments Incorporated | Hybrid closed-loop/open-loop magnetic current sensor |
EP3812785A1 (de) * | 2019-10-22 | 2021-04-28 | LEM International SA | Fluxgate-stromwandler |
-
2020
- 2020-03-31 EP EP20166923.1A patent/EP3889618A1/de not_active Withdrawn
-
2021
- 2021-03-24 JP JP2022559664A patent/JP2023519988A/ja active Pending
- 2021-03-24 WO PCT/EP2021/057616 patent/WO2021197970A1/en unknown
- 2021-03-24 EP EP21713675.3A patent/EP4127738A1/de active Pending
- 2021-03-24 CN CN202180024015.XA patent/CN115362376A/zh active Pending
- 2021-03-24 US US17/915,614 patent/US20230132919A1/en active Pending
- 2021-03-24 KR KR1020227037710A patent/KR20220164529A/ko active Search and Examination
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5461353A (en) * | 1994-08-30 | 1995-10-24 | Motorola, Inc. | Printed circuit board inductor |
US6366076B1 (en) * | 1997-04-21 | 2002-04-02 | Liaisons Electroniques-Mecaniques Lem Sa | Device with wide passband for measuring electric current intensity in a conductor |
EP1965217A1 (de) | 2007-03-02 | 2008-09-03 | Liaisons Electroniques-Mecaniques Lem S.A. | Stromsensor mit offenem Regelkreis und hoher Bandbreite |
US20090167301A1 (en) * | 2007-12-27 | 2009-07-02 | Infineon Technologies Ag | Integrated circuit including a magnetic field sensitive element and a coil |
US20140253108A1 (en) * | 2013-03-08 | 2014-09-11 | Deere & Company | Method and sensor for sensing current in a conductor |
US20150219692A1 (en) * | 2013-12-11 | 2015-08-06 | Deere & Company | Current sensor and control circuit |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4235193A1 (de) * | 2022-02-28 | 2023-08-30 | LEM International SA | Magnetfelddetektormodul |
WO2023161138A1 (en) * | 2022-02-28 | 2023-08-31 | Lem International Sa | Magnetic field detector module |
Also Published As
Publication number | Publication date |
---|---|
WO2021197970A1 (en) | 2021-10-07 |
CN115362376A (zh) | 2022-11-18 |
US20230132919A1 (en) | 2023-05-04 |
KR20220164529A (ko) | 2022-12-13 |
JP2023519988A (ja) | 2023-05-15 |
EP4127738A1 (de) | 2023-02-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1965217B1 (de) | Stromsensor mit offenem Regelkreis und hoher Bandbreite | |
US6366076B1 (en) | Device with wide passband for measuring electric current intensity in a conductor | |
US6094044A (en) | AC current sensor having high accuracy and large bandwidth | |
JP3096413B2 (ja) | 磁気検出素子、磁気センサー、地磁気検出型方位センサー、及び姿勢制御用センサー | |
TWI499783B (zh) | 射頻感測器系統與射頻感測方法 | |
US7259545B2 (en) | Integrated sensor | |
US20230132919A1 (en) | Current transducer | |
US11879951B2 (en) | Magnetic field sensor apparatus | |
EP1467214A2 (de) | Stromsensor und Stromdetektionsvorrichtung die diesen verwendet | |
US5736846A (en) | AC current sensor | |
Ripka et al. | Pulse excitation of micro-fluxgate sensors | |
US3551706A (en) | Hall effect device configurations for extended frequency range | |
GB2461207A (en) | Magnetic sensor with compensation for lead and coil resistance | |
WO2017163471A1 (ja) | 磁気センサ | |
CN114705115A (zh) | 一种涡流传感器 | |
JPH11304896A (ja) | 磁気センサ装置 | |
Moser et al. | Non-invasive wide-bandwidth current sensor for wide-bandgap devices | |
CN114878895A (zh) | 一种集成到功率模块内部的开关电流测量方法 | |
CN115993560A (zh) | 磁传感器 | |
KR20240001783A (ko) | 자기장 검출 장치 | |
WO2001033242A1 (en) | A thin magnetoresistive current sensor system | |
JPH0650321B2 (ja) | 電流検出器 | |
JP2005167936A (ja) | フィルタ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20220407 |